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Revenue from Contracts with Customers - Disaggregation of Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 478	$ 544	$ 946	$ 1,050
Americas
Disaggregation of Revenue [Line Items]
Revenue	269	287	538	551
EMEA
Disaggregation of Revenue [Line Items]
Revenue	122	127	235	276
APAC
Disaggregation of Revenue [Line Items]
Revenue	87	130	173	223
Recurring
Disaggregation of Revenue [Line Items]
Revenue	338	312	669	614
Recurring | Americas
Disaggregation of Revenue [Line Items]
Revenue	217	199	430	392
Recurring | EMEA
Disaggregation of Revenue [Line Items]
Revenue	75	70	148	137
Recurring | APAC
Disaggregation of Revenue [Line Items]
Revenue	46	43	91	85
Perpetual software licenses and hardware
Disaggregation of Revenue [Line Items]
Revenue	29	97	60	166
Perpetual software licenses and hardware | Americas
Disaggregation of Revenue [Line Items]
Revenue	12	40	31	62
Perpetual software licenses and hardware | EMEA
Disaggregation of Revenue [Line Items]
Revenue	10	10	17	43
Perpetual software licenses and hardware | APAC
Disaggregation of Revenue [Line Items]
Revenue	7	47	12	61
Consulting services | Americas
Disaggregation of Revenue [Line Items]
Revenue	40	48	77	97
Consulting services | EMEA
Disaggregation of Revenue [Line Items]
Revenue	37	47	70	96
Consulting services | APAC
Disaggregation of Revenue [Line Items]
Revenue	$ 34	$ 40	$ 70	$ 77

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+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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